How to calculate percentage right for multiple choice multiple answer

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For school. I have a project where we had to take a survey. The questions were multiple choice and they could have multiple answers per question. For example we had one questions with 2 right answers and 7 total. We want to also penelize people who fill in wrong answers next to the right answer. For this example 100% score would be the 2 right answers and no others. Everything wrong would be none of of the right answers and then the amount of wrong answers wouldn't matter. Is there any way to mathematicly calculate this?

Thanks already